<div id="footer">
    <p class="up">
        <a href="#header" title="回到顶部">top</a>
    </p>
    <p class="credit">
        Powered by <a class="yellow" href='http://rubyonrails.com' title='Powered by Ruby on Rails'><strong>Ruby on Rails</strong></a>
    </p>
</div>
